If you get a System Error ID =01 when attempting to Copy or Paste (or simply access the edit menu item) with a Library Item open in Claris CAD, it may be due to an incompatibility with a Startup document (INIT), Tear-Off Menus.
This information was provided by Claris Corporation on 16 March 1998, and incorporated into Apple Computer's Tech Info Library.
If you remove this Startup document (INIT), the problem should go away. Tear-Off Menus can be turned off from the Control Panel. Tear-Off Menus is made by Advanced Interface Programming.